switch (error.code) {
  case "EACCES":
    console.error(bind + " requires elevated privileges");
    process.exit(1);
    break;
  case "EADDRINUSE":
    console.error(bind + " is already in use");
    server.listen(++port);
    console.error(`try http://localhost:${port}`);
    // process.exit(1);
    break;
  default:
    throw error;
}